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Bolt Tensioning And Torquing

With the varying problems that occur during hook-up and commissioning or shutdown operations, it has become apparent that an integrated service is required. ENVITE's response has been to form a team capable of finding and repairing leaks. Offering this extra dimension can help save time and money since one contractor can control a complete leak testing project with fewer personnel onboard overall, but effectively doing more work.

Once leaks are identified ENVITE's integrated service team will carry out leak repairs with the system depressurised. All flange bolts over 1” would be hydraulically bolt tensioned and all bolts below 1” would be hydraulically torqued or hand torqued. ENVITE will not carry out flogging under pressure.

 The bolt load on the leaking flange is initially taken to the minimum acceptable level in accordance with specifications. The tension is then progressively increased in increments until the leak is sealed or until the maximum recommended bolt load is reached. If at this bolt load the leak has not sealed then this will be reported to the client to approve further bolt tensioning or allow inspection, gasketrenewal or reworking.

Procedures will be supplied including tensioning or torquing data sheets on specific classifications of joints and bolt material calculations. Aflange record would be kept and issued for each joint repaired by this method.

Since 2010 Envite Nigeria Limited began offering these services, we have been involved in both major and minor projects in the oil and gas industries. Though new as a company, we have made some advancement in our quality delivery and this gave rise to the numerous customers we are servicing in the industry. The bulk of our involvement has been in the complete proof load testing and certifications, coupled with other complementary services such as Leasing, flushing, valve servicing and maintenance, corrosion monitoring, and chemical injection, bolt tensioning and instrument calibrations.